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Chapter 4 WAN
Basic Home Station VDSL2 P8701T User’s Guide
76
IPv6 Subnet Masking
Both an IPv6 address and IPv6 subnet mask compose of 128-bit binary digits, which are divided
into eight 16-bit blocks and written in hexadecimal notation. Hexadecimal uses four bits for each
character (1 ~ 10, A ~ F). Each block’s 16 bits are then represented by four hexadecimal
characters. For example, FFFF:FFFF:FFFF:FFFF:FC00:0000:0000:0000.
4.1.3
Before You Begin
You need to know your Internet access settings such as encapsulation and WAN IP address. Get this
information from your ISP.
4.2
The Layer-2 Interface ATM Screen
The VDSL Router must have a layer-2 interface to allow users to use the DSL port to access the
Internet. The screen varies depending on the interface type you select. Log into the VDSL Router’s
web configurator and click
Wireless network > Classic configuration > Advanced Setup >
Layer2 Interface > ATM Interface
to manage the ATM layer-2 interfaces.
Note: The ATM and PTM layer-2 interfaces cannot work at the same time.
Figure 16
Layer-2 Interface: ATM
The following table describes the fields in this screen.
Table 13
Layer-2 Interface: ATM
LABEL
DESCRIPTION
Interface
The name of a configured layer-2 interface.
Vpi
This displays the Virtual Path Identifier (VPI).
Vci
This displays the Virtual Channel Identifier (VCI).
DSL Latency
This displays whether the ATM interface uses interleave delay (
Path1
) or fast mode with
no interleave delay (
Path0
).
Category
This displays the ATM traffic class.
Peak Cell Rate
This displays the maximum rate at which the sender can send cells.
Sustainable Cell
Rate
This displays the average cell rate (long-term) at which the sender can send cells.
Max Burst Size
This displays the maximum number of cells that can be sent at the peak rate.
Link Type
This is the DSL link type of the ATM layer-2 interface.
Conn Mode
This shows the connection mode of the layer-2 interface.
Page 77 / 240
Chapter 4 WAN
Basic Home Station VDSL2 P8701T User’s Guide
77
4.2.1
Layer-2 ATM Interface Configuration
Click the
Add
button in the
Layer2 Interface: ATM
screen to open the following screen. Use this
screen to create a new layer-2 interface. You can have multiple ATM layer-2 interfaces using
different VPI and/or VCI values. The screen varies depending on the interface type you select.
Figure 17
DSL ATM Interface Configuration
IP QoS
This displays whether QoS (Quality of Service) is enabled on the interface.
MPAAL
Prec/Alg/Wght
This displays the interface’s default queue precedence, queuing algorithm, and weighted
round robin weight.
Remove
Select an interface and click the
Remove
button to delete it. You cannot remove a layer-
2 interface when a WAN service is associated with it.
Add
Click this button to create a new ATM layer-2 interface.
Table 13
Layer-2 Interface: ATM (continued)
LABEL
DESCRIPTION
Page 78 / 240
Chapter 4 WAN
Basic Home Station VDSL2 P8701T User’s Guide
78
The following table describes the fields in this screen.
Table 14
Layer-2 ATM Interface Configuration
LABEL
DESCRIPTION
ATM PVC
Configuration
VPI (Virtual Path Identifier) and VCI (Virtual Channel Identifier) define a virtual circuit.
This section is available only when you configure an ATM layer-2 interface.
VPI
The valid range for the VPI is 0 to 255. Enter the VPI assigned to you.
VCI
The valid range for the VCI is 32 to 65535 (0 to 31 is reserved for local management of
ATM traffic). Enter the VCI assigned to you.
Select DSL Latency
Select
Path0 (Fast)
to use no interleaving and have faster transmission (a “fast
channel”). Suitable only for a good line with little need for error correction.
At the time of writing the VDSL Router supports fast mode only and interleaved is
reserved for future use.
Select DSL Link
Type
Select
EoA
(Ethernet over ATM) to have an Ethernet header in the packet, so that you
can have multiple services/connections over one PVC. You can set each connection to
have its own MAC address or all connections share one MAC address but use different
VLAN IDs for different services.
EoA
supports ENET ENCAP (IPoE), PPPoE and RFC1483/
2684 bridging encapsulation methods.
Select
PPPoA
(PPP over ATM) to allow just one PPPoA connection over a PVC.
Select
IPoA
(IP over ATM) to allow just one RFC 1483 routing connection over a PVC.
Encapsulation
Mode
Select the ISP’s method of multiplexing.
•
VC/MUX:
In VC multiplexing, each protocol is carried on a separate ATM virtual
circuit (VC). To transport multiple protocols, the VDSL Router needs separate VCs.
There is a binding between a VC and the type of the network protocol carried on the
VC. This reduces payload overhead since there is no need to carry protocol
information in each Protocol Data Unit (PDU) payload.
•
LLC/SNAP-BRIDGING
: In LCC encapsulation, bridged PDUs are encapsulated by
identifying the type of the bridged media in the SNAP header. This is available only
when you select
EoA
in the
Select DSL Link Type
field.
•
LLC/ENCAPSULATION
: More than one protocol can be carried over the same VC.
This is available only when you select
PPPoA
in the
Select DSL Link Type
field.
•
LLC/SNAP-ROUTING
: In LCC encapsulation, bridged PDUs are encapsulated by
identifying the type of the bridged media in the SNAP header. This is available only
when you select
EoA
in the
Select DSL Link Type
field.
Service Category
Select
UBR Without PCR
or
UBR With PCR
for applications that are non-time
sensitive, such as e-mail.
Select
CBR
(Continuous Bit Rate) to specify fixed (always-on) bandwidth for voice or
data traffic.
Select
Non Realtime VBR
(non real-time Variable Bit Rate) for connections that do not
require closely controlled delay and delay variation.
Select
Realtime VBR
(real-time Variable Bit Rate) for applications with bursty
connections that require closely controlled delay and delay variation.
Peak Cell Rate
Divide the DSL line rate (bps) by 424 (the size of an ATM cell) to find the Peak Cell Rate
(PCR). This is the maximum rate at which the sender can send cells. Type the PCR here.
This field is not available when you select
UBR Without PCR
.
Sustainable Cell
Rate
The Sustain Cell Rate (SCR) sets the average cell rate (long-term) that can be
transmitted. Type the SCR, which must be less than the PCR. Note that system default is
0 cells/sec.
This field is available only when you select
Non Realtime VBR
or
Realtime VBR
.
Maximum Burst
Size
Maximum Burst Size (MBS) refers to the maximum number of cells that can be sent at
the peak rate. Type the MBS, which is less than 65535.
This field is available only when you select
Non Realtime VBR
or
Realtime VBR
.
Page 79 / 240
Chapter 4 WAN
Basic Home Station VDSL2 P8701T User’s Guide
79
4.3
The Layer-2 Interface PTM Screen
The VDSL Router must have a layer-2 interface to allow users to use the DSL port to access the
Internet. The screen varies depending on the interface type you select. Log into the VDSL Router’s
web configurator and click
Wireless network > Classic configuration > Advanced Setup >
Layer2 Interface > PTM Interface
to manage the PTM layer-2 interfaces.
Note: The ATM and PTM layer-2 interfaces cannot work at the same time.
Figure 18
Layer-2 Interface: PTM
Scheduler
Select the scheduler to use for queues that have the same precedence as the default
queue. Queuing applies only when a port has more traffic than it can handle.
Weighted Round Robin
scheduling services queues of the same priority level on a
rotating basis based on their queue weight. The higher a queue’s weight, the more
service it gets. This queuing mechanism divides any available bandwidth across the
different traffic queues and returns to queues that have not yet emptied.
Weighted Fair Queuing
guarantees each queue's minimum bandwidth based on its
queue weight during traffic congestion. This queuing mechanism divides any available
bandwidth across the different traffic queues. Weighted fair queuing handles packets of
various sizes better than weighted round robin queuing does.
Default Queue
Weight
Specify the VC’s weight for weighed fair queuing. The higher the weight, the bigger
portion of the bandwidth the VC gets.
Default Queue
Precedence
Specify the VC’s priority for weighed fair queuing. The smaller the number the higher
the priority.
VC WRR Weight
Specify the VC’s weight for weighted round robin queuing. The higher the weight, the
bigger portion of the bandwidth the VC gets.
VC Precedence
Specify the VC’s priority for weighted round robin queuing. The smaller the number the
higher the priority.
Back
Click this button to return to the previous screen without saving any changes.
Apply/Save
Click this button to save your changes and go back to the previous screen.
Table 14
Layer-2 ATM Interface Configuration (continued)
LABEL
DESCRIPTION
Page 80 / 240
Chapter 4 WAN
Basic Home Station VDSL2 P8701T User’s Guide
80
The following table describes the fields in this screen.
4.3.1
Layer-2 PTM Interface Configuration
Click the
Add
button in the
Layer2 Interface: PTM
screen to open the following screen. Use this
screen to create a new layer-2 interface.
Figure 19
DSL PTM Interface Configuration
Table 15
Layer-2 Interface: PTM
LABEL
DESCRIPTION
Interface
The name of a configured layer-2 interface.
DSL Latency
This displays whether the ATM interface uses interleave delay (
Path1
) or fast mode with
no interleave delay (
Path0
).
PTM Priority
This does not apply at the time of writing.
Conn Mode
This shows the connection mode of the layer-2 interface.
IP QoS
This displays whether QoS (Quality of Service) is enabled on the interface.
Remove
Select an interface and click the
Remove
button to delete it. You cannot remove a layer-
2 interface when a WAN service is associated with it.
Add
Click this button to create a new ATM layer-2 interface.

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